The amount of gas needed for 875 miles depends on the fuel efficiency of the vehicle. Let's assume that the car gets 30 miles per gallon (mpg). To calculate the amount of gas needed, we divide the distance by the fuel efficiency:
Gas needed = Distance / Fuel efficiency
Gas needed = 875 miles / 30 mpg
Gas needed ≈ 29.17 gallons
Therefore, approximately 29.17 gallons of gas would be required for 875 miles in a car with a fuel efficiency of 30 mpg.